The late-1980s “discovery” of carbon dioxide–induced global warming thus came more than a century after Foote and Tyndall made the link clear, nearly four generations after Arrhenius published a good quantitative estimate of the possible global warming effect, more than a generation after Revelle and Suess warned about an unprecedented and unrepeatable planet-wide geophysical experiment, and a decade after modern confirmation of climate sensitivity. Clearly, we did not have to wait for new computer models or for the establishment of an international bureaucracy to be aware of this change and
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